基本调制识别。识别2ask，2fsk，2psk，4ask，4fsk，4psk。-The basic modulation recognition. Identification 2ask, 2fsk, 2psk, 4ask, 4fsk, 4psk.

4元FSK调制输出功率谱，基带码元传输间隔0.1s，FSK调制参数的频率间隔分别设置为5HZ和20Hz，-4 yuan FSK modulated output power spectrum, the baseband symbol transmission interval of 0.1s, the frequency interval FSK modulation parameters are set to 5HZ and 20Hz,